gecko-dev/editor/base/InsertTextTxn.cpp

236 lines
6.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "InsertTextTxn.h"
#include "nsEditor.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMSelection.h"
#include "nsIPresShell.h"
#include "EditAggregateTxn.h"
static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#else
static const PRBool gNoisy = PR_FALSE;
#endif
nsIAtom *InsertTextTxn::gInsertTextTxnName;
nsresult InsertTextTxn::ClassInit()
{
if (nsnull==gInsertTextTxnName)
gInsertTextTxnName = NS_NewAtom("NS_InsertTextTxn");
return NS_OK;
}
InsertTextTxn::InsertTextTxn()
: EditTxn()
{
}
InsertTextTxn::~InsertTextTxn()
{
}
NS_IMETHODIMP InsertTextTxn::Init(nsIDOMCharacterData *aElement,
PRUint32 aOffset,
const nsString &aStringToInsert,
nsIPresShell *aPresShell)
{
#if 0 //def DEBUG_cmanske
nsString text;
aElement->GetData(text);
printf("InsertTextTxn: Offset to insert at = %d. Text of the node to insert into:\n", aOffset);
wprintf(text.GetUnicode());
printf("\n");
#endif
mElement = do_QueryInterface(aElement);
mOffset = aOffset;
mStringToInsert = aStringToInsert;
mPresShell = aPresShell;
return NS_OK;
}
NS_IMETHODIMP InsertTextTxn::Do(void)
{
if (gNoisy) { printf("Do Insert Text element = %p\n", mElement.get()); }
// advance caret: This requires the presentation shell to get the selection.
nsCOMPtr<nsIDOMSelection> selection;
nsresult result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
NS_ASSERTION(selection,"Could not get selection in InsertTextTxn::Do\n");
if (NS_SUCCEEDED(result) && selection) {
result = mElement->InsertData(mOffset, mStringToInsert);
if (NS_SUCCEEDED(result)) {
result = selection->Collapse(mElement, mOffset+mStringToInsert.Length());
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after insert.");
}
}
return result;
}
NS_IMETHODIMP InsertTextTxn::Undo(void)
{
if (gNoisy) { printf("Undo Insert Text element = %p\n", mElement.get()); }
nsresult result;
PRUint32 length = mStringToInsert.Length();
result = mElement->DeleteData(mOffset, length);
if (NS_SUCCEEDED(result))
{ // set the selection to the insertion point where the string was removed
nsCOMPtr<nsIDOMSelection> selection;
result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
if (NS_SUCCEEDED(result) && selection) {
result = selection->Collapse(mElement, mOffset);
NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of insert.");
}
}
return result;
}
NS_IMETHODIMP InsertTextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
// set out param default value
if (nsnull!=aDidMerge)
*aDidMerge=PR_FALSE;
nsresult result = NS_OK;
if ((nsnull!=aDidMerge) && (nsnull!=aTransaction))
{
// if aTransaction isa InsertTextTxn, and if the selection hasn't changed,
// then absorb it
InsertTextTxn *otherInsTxn = nsnull;
aTransaction->QueryInterface(InsertTextTxn::GetCID(), (void **)&otherInsTxn);
if (otherInsTxn)
{
if (PR_TRUE==IsSequentialInsert(otherInsTxn))
{
nsAutoString otherData;
otherInsTxn->GetData(otherData);
mStringToInsert += otherData;
*aDidMerge = PR_TRUE;
if (gNoisy) { printf("InsertTextTxn assimilated %p\n", aTransaction); }
}
NS_RELEASE(otherInsTxn);
}
else
{ // the next InsertTextTxn might be inside an aggregate that we have special knowledge of
EditAggregateTxn *otherTxn = nsnull;
aTransaction->QueryInterface(EditAggregateTxn::GetCID(), (void **)&otherTxn);
if (otherTxn)
{
nsCOMPtr<nsIAtom> txnName;
otherTxn->GetName(getter_AddRefs(txnName));
if (txnName && txnName.get()==gInsertTextTxnName)
{ // yep, it's one of ours. By definition, it must contain only
// another aggregate with a single child,
// or a single InsertTextTxn
nsCOMPtr<EditTxn> childTxn;
otherTxn->GetTxnAt(0, getter_AddRefs(childTxn));
if (childTxn)
{
nsCOMPtr<InsertTextTxn> otherInsertTxn;
otherInsertTxn = do_QueryInterface(childTxn);
if (otherInsertTxn)
{
if (PR_TRUE==IsSequentialInsert(otherInsertTxn))
{
nsAutoString otherData;
otherInsertTxn->GetData(otherData);
mStringToInsert += otherData;
*aDidMerge = PR_TRUE;
if (gNoisy) { printf("InsertTextTxn assimilated %p\n", aTransaction); }
}
}
}
}
NS_RELEASE(otherTxn);
}
}
}
return result;
}
NS_IMETHODIMP InsertTextTxn::Write(nsIOutputStream *aOutputStream)
{
return NS_OK;
}
NS_IMETHODIMP InsertTextTxn::GetUndoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Remove Text: ";
*aString += mStringToInsert;
}
return NS_OK;
}
NS_IMETHODIMP InsertTextTxn::GetRedoString(nsString *aString)
{
if (nsnull!=aString)
{
*aString="Insert Text: ";
*aString += mStringToInsert;
}
return NS_OK;
}
/* ============= nsISupports implementation ====================== */
NS_IMETHODIMP
InsertTextTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
if (nsnull == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(InsertTextTxn::GetCID())) {
*aInstancePtr = (void*)(InsertTextTxn*)this;
NS_ADDREF_THIS();
return NS_OK;
}
return (EditTxn::QueryInterface(aIID, aInstancePtr));
}
/* ============ protected methods ================== */
NS_IMETHODIMP InsertTextTxn::GetData(nsString& aResult)
{
aResult = mStringToInsert;
return NS_OK;
}
PRBool InsertTextTxn::IsSequentialInsert(InsertTextTxn *aOtherTxn)
{
NS_ASSERTION(nsnull!=aOtherTxn, "null param");
PRBool result=PR_FALSE;
if (nsnull!=aOtherTxn)
{
if (aOtherTxn->mElement == mElement)
{
// here, we need to compare offsets.
PRInt32 length = mStringToInsert.Length();
if (aOtherTxn->mOffset==(mOffset+length))
{
result = PR_TRUE;
}
}
}
return result;
}